Power transmission chain



Nov. 3, 1931. F. L MORSE I POWER TRANSMISS-ION CHAVIN Filed Feb. 1, 1928 5 Sheets-Sheet 1 I NVE NTOR M f Wm PM ATTORNEY? Nov. 3, 1931. F. MORSE POWER TRANSMISSION CHAIN Filed Feb. 1, 1928 5 Sheets-Sheet 4 IN VEN TOR.

ATTORNEYS elf the-wheel. I

' Another'objec't resides; in the provision of Patented Nov. 3,

QFFICE l FRANK nivxonsnorrirnAcA, NEWYOBK, AssIeNon r MORSE CHAIN COMPANY, or 1 -ITHACA,',YNEW YORK, A conronerron or NEW YORK rowers rnenslurssron' CHAIN application filed February 1, 1928. Serial No. 250,987.

7 -T his"inventi0n relates to chainsusedin the transmission of power, especially chains of the so -called silent type which are run at; relatively high speeds. Chains'of any type when running on rapidly rotating sprockets may. develop Ino1se and ,vibrat on at certain speeds while running quite smoothly atother:

speeds. j Periodic shocks or'changes in velocity or direction as the chain meets the sprocket 'maycre'ate effects under highspeecl condi- 'tions which are highly objectionable in certain classes of service. Tomeet such serv' ice inan effective manner, many, factors must be considered, and it is especially desirable to "eliminate or ofls'etall factors that, tend tointroduce vibrations or periodic shocks,

however sli-glit' I g The ordinary chain, in running on a sprocket, does notmeet it, exactly tangentially, but engages a sprocket tooth somewhat.

beforethe point of tangency, and isthen carried slightlyiupward and over the top of the sprocket. before it settles into final en-.

gagement andis carried down around the sprocket. While the up and'down motion thus transmitted to thel'free chain is very.

on a'straight line during the process of en.-'

gagement with a sprocket tooth; so that what ever the motions given the parts incontact with the sprocket wheel,the free portions of the chain will receive, merely astra-ight line pull.

. The purpose tive manner during the engaging'period' so as tolead the cham more smoothly on and a chain drive in which. acceleration of the chain duringjinitial engagement with thesp'rocket over the normal speedofthechain is substantially eliminated. Still another object-is to control the action tu dinally. 1 d :How. thefforegoing, together with such of the presentinvention is to improve drive chains along these lines par ticularlybyproviding means for shifting the centercf articulation in a definite andposi-j of the bearing and-wearing surfaces so as to regulate wean] further object is to control the kinematlc act on of a running chain, and various other b ects'Will beco 'e apparent as the descriptionproceeds.

In otherapplications I haveshown, in vari eus forms, chains having transverse motion of the center of articulation, in which the joint more or less freely seeks. new positions under'thetensions and turning forces ap! plied. In the'present invention I now arbitrarily modify and control these shifting joint actions,often in the middle ofor contrary to the natural action of the joint under tension; and for this purpose employ cam surfaces; stops, and/or interferences between.

control desired. I

I am aware that shiftingjoints have been made which had merely the elfect of lengthen ing or shortening the effective length of the link or chain, without materially correcting the action ofthe chain up and down, i. e., the

any of the various moving parts to effect the motion of the chaintransverse tothe line of pull. ,[Such joints do not accomplish the purpose of this invention, which is disshortening or lengthening the chain longiother objefcts and advantages as may be incident tomy invention, are obtained. is illus-' accompanying drawings,

' of the chain [shown in Fig. 1, illustrating different phases of the joint action. In the forego ng figures the sides of the plntle holes are used as cammmg or controlling surfaces,

. Figs. 5 and 6 are modificationsin which thecontrolling or limiting faces are locatedwithin the'pintle members themselves;

(iii

' Fig.

Fig. 7 is another modification in which the side bushings attached to adjoining links cam upon each other.

Fig. 8 shows a joint controlled bycam surfaces outside of the pintle holes.

Figs. 9 and 10 Y are enlarged details of 11' illustrates .a

Fig. pin and bushing type of joint controlled by cams.

way to Figs. 2," 3 and 4, but show a double con- Figs. 12,13 and 14 correspond in a general 7 cave floater instead of a double convex floater.

,t'ain ,clearances'and relationsto the sides of the. pintle'holes so as to controlthe shifting 7 ofthe centerfof articulation inward during partflof its action. and outward during ani other part of its action, so as to ofisetthe op- 'p'osite action which is normally created by These are onlya few ofthevarious forms.

in which the invention may be applied, but will serveto make clear the principles thereof, and the various possible applications to different chains will then'be apparent to'those skilled in the art.

" the "form'shownin 1, 2, 3 and 4, a three partpintle' isillustrated. having cersprocket teeth engaging a chain, and provide a compensat ng jo nt.

'{By inward or downward as used in this specification, I mean in a general direction' toward the line connecting the centers of .the sprocket wheels of a chain drive, and by i the left being fullybent as when completely seated in a sprocket. 7 Thejoints are shown on a larger scalein Figs. 2 to 4 inclusive, in which Fig. 2 shows the olnt when stra ght,

Fig. 3 when half bent, and Fig. 4 when bent the full amount.

The links 2, 2, etc., are "generally con- "structedof interspersed arch shaped link.

plates, which canjbe built up to any desired length and width inthe ordinary. manner of silent chains'. In the drawings the usual end washers are removed .and the pintle parts or joints are shown in,cross-section so as to better illustrate their action. The three parts ofthejoint areindicated by the reference numerals '3, 4 and 5 The part 3 has a concave bearing face, and has its back sev cured or keyed to one set of link plates; the part a is secured orjkeyed to the adjacent set of link platesand has a concavebearingxface facing the part The third'pintle'partor afioater 5 is not rigidly secured to either set of link plates, and -isof double convex form-fit-.

are possible; for examplathetwo parts 3 and 4 may both move relative to the floater 5 or vice versaythe floater. 5 may stay" with the part 3, and both 3-an'd 5-turn or slide asa unit relative to thepart 4;or fl and 5 :maybe lockedas a unitand the part .3 moverelative to them. Various motions can thus be created within the joint, when, as by the present invention, the action of these parts can be regulated and controlled. It is desired to take forces created by the bending of the chain and apply them to the pintle parts so as to modify or direct their action to give the proper motion tothe chain. To; do this we may either use forcesoperating within or between the pintle parts themselves, or between the pintle parts and the walls of the pintle "holes ofthe adjacent linkswhich move relative thereto ;or cams orcontrol elements external of the pintle holes but. operating through the links; and any combinations of these parts v V1 e will first take up an example in which the sides of the pintle holes are used as controllingfac'es as in Figs. .1, 2, 3 and 4, and'see how it can beniadetofgive a double compensating action. j ,7 i-

It will be understood that complete compensation requires a double action, When an ordinary chain runson a sprocket, the first action of a'sprocket tooth is to lift'the line .of pull of the chain slightly during "a movement of the toothcorrespondin'g to half the pitch, and then tofdrop the chainslightly during the next half of the pitch movemen in other words, an ordinary chain runs on a sprocket wheel asjthough, the wheel were a many-sided polygon, being continually lifted up and down.- This actionlhas been known and attempts have been made'to compensate it. But the so-called compensating joints heretofore have shifted their center of articulation only in one direction during the movement of one pitch or tooth, so'that they did 1 not compensate for both the outward and inward motion'that occurs. 7 By double corn- 1 pensating action I, mean that the joint is arranged so that it can compensate in one direction for part ofthe bend of the chain, and in another direction during the rest of the bend of "the chain, so as tov give a comment. r V. Referring now toFigs. 1 and 2, it will be noted that when the chainis straight, the

pensating effect throughout the'whole enga gefloater 5 is in contact at the point 7 with the 2 upper side of the pintleh'ole of the link plate to which the part :3, keyed. The floater designedso thatit' naturally seek this upper position under tension of the chain in the straight position, the centers ofthe bearangle of bend of the chain, so that 'undertension when-straight there is an unbalanced ups ward component to hold the floater '5 against the uppersidei'. ,1

NVhen theqc'hain begins to bend, the joint turns orslides in general in the concave surface of thep'rart 4, the parts sand moving as a'unitowing to the fact that the upper-part of the floater 5 is in contactat 7 with the link plate holding the part :3. Since the center of curvature of the bearing face of the part4 is ahead or forwardofthe joint, the parts 3-and 5, together with the free or straight parmof "the chain attached thereto, moves downward rel'ative to the 'pintlehole of the link plate which is keyedtothe part.4iwhich is the linkiplate'that hasibeen fl engaged by the sprocket tooth and is'rinthe process of turn-- ing on the arc of the-'wheelw-Thus,whilethe part4 has beenpicked up by the sprocket tooth'and isgbeingcarriedaupward and around the sprocket, the free part ofthe chain attached toit-heparts3 and 5 ismofving down.- ward relative to the part 4 in a compensating directiomso that-the end of the chain is car-,v

ried "substantially straight forward without vertical motion, or at least the vertical motion is "very; greatly reduced; ,This action will be clearly understood by. [comparing Figs. 2

- When the tooth has'traveled halfa pitch, forward, the part 4 which has been fixed thereto will have reachedtheihighest point in its;rotation an'dfrom then} on .will tend to sink around the back of the-sprockeuwhich wouldtend to carry the freeend of the chain downward rather than upward, Therefore, the compensating action should be reversed and shouldjbe upward in ordeI'i-hat the free part of'the chain may continue tobe carried. substantially straight forward during the latter; part" of the 3 engaging action. This is accomplished in the following manner.

N hen the bending action is about half way completed as shown in Fig. 3,, the: clearances are arranged so, that the floater 5 willstrike atthe zpointa8 on; the 'lower 'sid'e. of the pintle hole in '{the 'linkjplateto, which the part 4 is keyed, thus stoppin'gthe motion on the concave face; of thegpa'rt ir The parts 4 and 5 thus become for the timebeing aunit, and anyfurther-rbending has to occur on the concave bearing face of the part- 3. This occurs by the parts 4 an d '5 as a unit turning within that face, or, in other, words, by: the part 3 moving upward relative to the parts-4 and" this being. permitted by the clearance which is below the parts 4 and5,the clearance being in the linkplate carrying the part The-pintlehole ofthe link plate towhich the part3 is keyed is generally arranged to, have ,aslight clearance over; the top of and alioundthe part 4, topermit this freemovement. However, the part 4 may strike the hole at9j if desired, instead of atfall: times having the clearance mentioned, and thus serve tostop the downward'movement of the part 5 in a somewhatless abrupt manner than if it merely was stopped by striking at the point 8 mentioned. Asthe upward movementof the part 3 continues, the lower clearance 10 of itslink plate is gradually diminished, so thatwhen the bend is completed the parts are in some such positionas shown in Fig.4. a a i Since thislatter part of the motion has carried the end ofthe free'chain upward relative to the part 4 which is on the sprocket tooth, it will be seen that it has been in a direction to compensate the downward portion oftheengaging action, so that the free chain is carried substantially straight forward throughout the entire engaging action, and the next, tooth can pick up the chain just as the-preceding one did, with little or-no vertical vibration. While have shown a'fioater controlled in the second part as well as the first part of its action, it will be understood that it, may also be left free or self controlled in thesecond part if desired, with turning occurring on'one orbothffaces'. V a

Inothedesign of such joints, either partially or'fully controlled, the degree of curvature-and location of the centers may be varied, the parts tilted or inclined to each other at various andtdifl'erentfangles, and the clear-o ancesand time of reversal in the action may be-changed tojvarious degrees'to take up or ing surfaces which operate to shift the joint in the propermanner, while the bending action between the linksisin progress, and these surfaces m'ay be within or between the pintle members themselves, or use the side walls as described, or may be between the link plates external to the joint in theform of cams, tongues or guides; and any combination; of these various devices may also be use 12 and the floater 5 provided with a; tongue 13 -the slot 12 being somewhat wider than the tongue 13 to permit vertical tr nsverse v movement between the parts 4 am 5 during partof the bend of the chain. hutthereafter limiting it so as to compel the part 3* to turn on the opposite face of. the floater 5 during the remainder of-the bending action.

V InlFig; 5 the 'face ofthepart a is made straightinsteadof curved, in which case the floater 5 will slip downward as soon as the part 4 hasturned' forward past the angle of friction, and the face of the part 4?, as well as the other face,may be initially tilted in various amounts. ".Fig. 6 shows another'in ternally controlled pintle action, the floater 5 'in this case'having double. convex faces with tongues 18"and13? on each face, and wider grooves 12 and 12 inthe parts 3 and j 4 respectively. It will be obvious that the same action canbeobtained if the tongue and groove are interchanged, that is, the groove may be inthe floater and the tongue project from the side'parts 31 or P. Similar tongue and groove internal controls may be. used where the floaters are double concave'instead 2 of double convex; as will bedes cribed, or with a concave-andstraight floater, in factany formof joint in which the internal parts have motion relative to each other, as will be obviousjto those skilled in the art;

I In: the modification shown in Fig. 7, the floater fi is notjdircctly cammed, but the motion of the joint is controlled-by the outside parts 3? and 4? camming on each other as, the

'joint'hends. This is a modification somewhat analogous to'the'externa'l cam-which will be described inzconnection with F ig. 10,; inasmuch as the parts 3? and-4 are keyedto their respective link plates and so" act as cams directly between the platesas in Fig. 10.

, However, in Fig. 7 the camming partslie within the pintle holes, and so in this respect are analogous to' the previously'described types. The, operation will be obvious from I the foregoing, it being noted that when the joint bends the can surface 15 on the part 4 first depresses the parts 3 and 5 ,'-and then when the part 5 stops,the part 3 is permitted to return. The parts 3 and 4 may be cammed on each other in various other ways,

above andibelow, but whenever this is done,

the floater or part 5 should be left free so that it may accommodate itself'on one face or the other or both' to whatever motions are impressed onthe joint by the cam action.

.In the modification shown inFig. 8, the controlling cam is ".IllOUlltiQd outside of the pintle holes and controls the 'j oint by directly controlling the'link plates between which it acts, --It;may be made in various forms, of

slots,jpins and grooves, etc.,- which may be g ven various configurations according to whatever motion is deslred, and 1n the form illustrated consists of a cam groove or slot 16 y in the link plate that is keyed tothe part' l T in which Fig.- 9'shows' the position when the chain is straight'and Fig. 1O when bent. Thev joint slides onthe straight face of the part4 i and turnsin the round face of thepart 3 ,and

and a followerpin 17 secured to the link plates that are'keyed to the part 3 The joint is shown on a larger scale in FigsL9 and 10,

its action is determined by the-"shape of the cam 16, so that any desired'jniotion may be given. While a straight face and a concave face are shown for purposes ofillustration, it will be obviousthat any joint action having a vertical shifting travel may be used with a proper cam control to g'ive the desired action, andthatthefaces may be'straight, convex or' concave, "or any combination of them, such as straight andconvex, double convex, double concave, concavo-convex, etc. While I have in the foregoing shown the application'of the invention to jointscomposed of three or more parts, itis-also applicable to'ordinary two part joints, either of the hushed orsingle pin type, provided that the joint has suflicient vertical play so that a camming 'or con'tjrolled action canbe im pressed on it. Aform of pin or bush joint controlled by a cam at the'top is shown in Fig. 11, in which thecam surface l6 in the link plate (2*,which i'sincontact with the sprocket-tootln is arrang'ed-tolfirst depress the bushingIS carrying the freefend of the chain and then toelevate it if desired, the cam surface actingagainst the follower pin 17 -which is part of the-link plate '2 It is not necessary that the I cam be located just as shown in the illustration, orgthatit have that particular configuration.- Itmay be located on various sides, and may be larger or smaller, andthe slot orcam face may open to the 'outside of the link plate, or into the pintle hole, and alsomay'be formed as a part thereof. Also, as will be'obvious from the foregoing, the cam or controlling surface may operate directly on; the bushing-or .on the pintle part; or the hole itself in the link plate may be used as the controlling surface, by

being arranged to. meetthe pintle part or bushing'when thejoint is partially bent,.so as to interrupt the transverse motion before the bend is wholly completed- These and various other modifications will be apparent to those skilled in the art from the foregoing description of the fundamental principles,

provided it is borne-in mind-that there is available to create the m'otionthe'relative movement of the partswhich'occurs when the 5 was double convex in cross-section, and

prefera-bly first turned on the'rear face and then on the'front face, the mo dificationshown in" Figs. 12, 1-3 and14hasan intermediate pintle member 5 which is double concave in th -andhave become relacross-section and the controlling" faces of the pintle holes are preferably arranged'so that the first motion is on its front face and the on its rear face during the next motion is engaging action.

Figs. 12, 13

is partly bent, and when'it is fully bent, re-

. spectively. Referring now to'Fig. 12, itwill floater isin contact at the point to create an'unbalanced vcomponent-tohold the floater; Whenthe chain begins to bend, and thejointbegins to Inove'toward' the posi-" tion shown in Fig. 13, the joint turns or slides in generalvon the concave forward face of the floater 5*, the convex face of the part 3 turn- 7 ing within it, while tl e'p'arts l and 5 remain together as a unit" owing to the fact that the lower part of the floater is in contact at 7 with the link plate holding the part4,

Since the center of 'curvatureof the part 3* is ahead or forward ot-the joint, the part 3 carrying the free or straight part ofthe chain'moves downward relative tothepintle hole'of-the link plate which is in contact with the sprockettooth, and thus moves against the lifting ofthe engaged tooth in a compensating direction', so that the chain is carried substantially straight forward with outvertical motion or at least the vertical motion is very greatly reduced;

'When'the tooth hastraveled half apitch forward, or substantially that amount, the parts will have reached the positionshown 1n Fig. 13, and the clearances are arranged so that the'floater 5 will strike at-the point 8,

on theupperside of the pintle hole the link plate'to which the part 3 is keyed, thus stop}; pingthe motion on the convex fiface of the part 3 The parts 3 and' 5? then become,

for the' time being, ajunit, and any; further bendingv has to" occur; on'th'e convexface of the part t 'whichthen turns the rearward concave face of the'ofloater' 5 as it rides upward thereon. ,ispermitted byfthe clearance10 which: is above the floater 5 1n the'link, connected'to the parte l As the upward movement of the part 3* and chain continue, thefloater moving therewith on the surfacefof the part-e finally reaches the position shown in Fig. 14, withthefloater' 51 above the'parti ll, or in other words, thepart 4 has travelled downward; relative to the floaterfti It will be seenthat thishasgivenf;

a double compensatingaction,since thefirs't, compensating motion was'downward and the later comp'ensatingmotion was upward. In-

the design ofsuch joints the degree of curva r and 14 show ta saa of; the joint whenthe' chain is. straight, when it tui'e and location" of the centers maybe varied, the parts tilted or inclined to each other at various angles and difl'erent positions, and the clearances and. time of re;

versalin the action may be changed to various, degrees to} take intojjaccounttimei lag in the action, and the'lshape'of the various parts and manner of keying may also vary in differentinstallations, as was the case with the double convex floater joint first described.

.I- have in the foregoing described the invention in various and preferred forms in order to make clear the principle thereof, but it will be understood that these are merely by way of illustration', and thatthe invention is susceptible to various modifications andadaptations as will'ibe apparent to those skilled in the art without'departing from the scope of thelinvention lowing claims.

Iclaim:+

1. In a power transmission chain adapted to run on a toothed sprocket, the combination of successive articulated links, and means; for introduc ng a double compensatingaction successively opposite directions during the process of bending the chain in running on the sprocket, whereby the polygonal action of the toothed sprocket is reduced;

, 2. In a power transmission device, the combination of a toothed sprocket, a chain composed of links adapted to run on said sprocket, and joints connecting said links,

said joints being capable of a shifting motion "transverse to the line of pull, first in one direction and then in another direction,as

the'ohain engages the sprocket, wherebythe polygonal action ofthe sprocket'is reduced. 3. In a power transmission chain, aipair oflink plates, a multi-part joint connecting said plates, the joint icoacting' with said plates to give transverse motions'about dif-i ferent centers at different stages in the joint action. a I V 4;; In a power transmlssion system, the" combination witha toothed sproeket,ofa chain comprising successive links, joints connecting the links, the center of articulation as defined in the folg of said j oints lying forward'of the joint d 1ir-'- ing the first portion of its action wheni engaging the sprocket, and ly'ing rearward of the joint during the latterlportion of the engaging action, whereby the polygonal ac-j jtion of the sprocket in engaging the chain is .7 o

transmission system, the

combination with toothedsprocket, of a, chain comprisingsuccessive links, joints conreduced;

5; In a power nectingthe links and 'arrangedto shift transversely tothe line of pull, the .shifting actions occurring. in; a direction towardthe. sprocket during the first; portion'of thernotion when a] link is engaging the'sprocketawd occurring in aj'direction away, from the sprocket during the latter portion of theengaging mo- .tiohfwheigehyitlfi polygonal action ofjthe- V, 6.' In apower transmission chain, the coinloin'ationfof av link having apintle hole therein ,"asecondflinkhavingfapintle hole of different configurationthan-the first mentioned: pintlehole to amamwm nt of. one link relative to the; other in a direction transverse the line of-pull, and pintle. parts passing through said'holes "to connect the links, and

" arranged to form a joint permitting one link h "or er.

to t irn relativetothe other through a full pitchangle the transverse motion being limited when-the link has turned only'a portion of the full pitch angle. j

l I 7.; In apower transmission chain,,the cont.

hil ation} of-a link h'avingapintle hole there;

H in, a second: linkihaving a pintlehole otlditv ferentconfig'uration thanfthe 'first mentioned I pintle hole to permit movement of one link relative to the other in a direction 'transverse the line ofjipnll, and. pintle parts passing through said holes to connect the links, and arranged to torma joint permitting one link tofiturnl relative, to the other through a full pitch angle, the ran v rse inotion being. limited by a pintle hole when the link has turned only" aportionlofthe run, pitch angle.

8. In a power transmission chain adapted tornn on a toothed, sprocket, the combination ot snccessivesets of links, andjjoints connect j ing said links,'the joints and links being ar-" ranged tojhave a, compensating action in a, direction inwardtoward the sprocket in the. $35- first'portion of the action in engaging a tooth,

and acompensating action in a direction out 'w ard vfroni the sprocket in a'late r portion of the engaging actiomf'whereby the polygonal effect: of the sprocket is'rednjced.

' r "95In apower transmission system C0111;

prising a chain and a toothed" sprocket, the

V method ot reducing the polygonaliaction of the sprocket which. consists in shifting. the

chain inward toward the sprocket in the first p ortionozt its engaging action and then out 'vvardltrom'the sprocket in the, later portion 7 of its engagingfact-iom, whereby the chain may enter, the sprocketloy continuously moving on siibstantially. the saine, straight "line;

i 7 10.1111 a power'trans nissionlchain, ,the; f. j combination-of;aslink having a pintle hole, a. r second linkfi having apintle hole, and a joint insaid: pintleholes connecting the links, said joint being capable of action-about a center: ,forwardof the joint anda center rearward ot'the joint and me'ans for changing the action from onejcenter to the other. 7 r j y ll; Ina power transmission chain, the; combination;offsnccessive'link plates con nected joints, eachjointbeing composed of pjarts Capflblfipf shifting the flinks llQliitive to each; other transversely tothe line; of pull, and means forfdirectingsaid transverseshift- -ingIindiIictiQ11s different fromjthose which,

' 7' weave. I

tend to be impelled loy the tension forces between the links v 12. In a power transmission chain, the

combinationof successive links, aljoint connecting said links, said joint coniprising a pintle-parthavin'g a bearing face whose cen ter of-j 'cnrvatnre is located forward of said jointand a second bearing face whose center of curvatnre is located rearwardof said joint,

and means for controllingthe joint soit will turn on oneof said bearing. faces before the 13. In apower transmissionichain, the

. combination ofalink having a'pintle hole, a. second link having a pintle hole, pintle memb ersiextending through said holes to .form a joint connecting said links, said joint permitting. vshitting of saidflinks v transversely'to the line of pull and being limited initsaction by contact with. a pintle hole before its action-is fully-completed.

l lgln a power transmission chain, thecomhination of a link having'a pintle hole,

second link having a pintle hole, a pintle partattached to the first link and having a hear ng tace,.a second pintlepart attached tothe second link and having'a hearing face,

and athirdpintle'part having bearing faces cooperating with-the first and secondr mena tioned bearing faces, the actlon ofthe third tioned bearing faces, the relative mot-ionihetweenone or the other pair of bearing faces being. constrained during the action so as to transfer the center of articulation from'one s de to the otherof the thirdpintle part.

16min a power transmission 1 chain, the I combination of a linkfihaving a pintle "hole; .a .second'link'. having pintle hole, pintle parts extending thronghsaid holes to form a joint connecting the links, a portion of i j e ng adapted a, shift the first link-in one direction relativeito the second, another portion of said joint being adapted to shift the first link in a diiierent direction than the first mentioned shifting motion, the

,, actionof the' joint being, first dominated bv one ofsaidport ions anclthen by the other, whe'rebytransverse shifting movements be- 'tween the links inay be obtained indifferent directions dnringone complete actionofthe joint,

alpofweri transmission chain, the combinatlon of a; l nk having'apintle-hole a' second' having a pintleholgipintle parts extending through said holes to form-a oint connecting the links, said joint having a concavo-convex bearing'surface facing for ward and a concave-convex bearing surface facing backward, the action of each of the bearing faces being limited to less thanthe total angular movement between the links.

18. In a' power transmission chain, the combination of a link having a pintle hole, a second link having a pintle'hole, pintle parts extending through said holes to form a joint connecting the links, saidjoint having a ccncavo-conve3 bearing surface facing forward and a concave-convex bearing surface facingbackward, the action of one of the bearing faces being stopped before the links have completed their total angular movement relative to each other.

19. In' a power transmission chain, the combination of a link having a pintle hole,

asecond link having apintle hole, pintle parts extending through. said holes to form a. j ointconnecting'the links, said joint hav-,

ing'a concavo-convex bearing surface facing forward and a concave-convex'bearing surface 'facingbackward, the action of the two.

bearing surfaces being limited at different points so that they may come into action successively as one link moves through its angular movement relative to the other.

, 20. In a" power chain drive, the combination of a sprocket havingteeth, a chain composed of links adapted to engage with said teeth prior to the point of tangency of the;

lineof pull to the pitch line,joints connecting said links and arranged'to permit mo tion transverse to the lineof pull of the free portion of the chain relative to'the link in the process of engagingthe sprocket, and means for directing said relative transverse motion in a direction in general toward the sprocket in the earlystages of engaging and during thein a direction in general opposite later stages of engagement.

21. In a power transmission chain, the

combination of a pintle part having two curved bearing surfaces whose centers of curvature lie outside of said pintle part, a chain link having a bearing surface cooperat' ping withone of said curved surfaces, a second chain link having a bearing surface cooperating with the other of; said bearing parts,'whereby said pintle partforms part of a chain joint, and means for causing said joint to move on one of said curved bearing surfaces before the other.v i I 22. Ina power transmission chain,- the combination of a pintle parthaving two curved bearing surfaces whose" centersv of curvature-lie outside of saidpintle part, a

chain linkhaving a bearingsurface cooperatin g with one of said curved surfaces, a sec-' ond chain link having, a bearing surface cooperating with the other of said bearing parts,whereby said pintle partforms partv ofa chain joint, and, camming means for causing said joint to move first on one of said curved bearing faces and then on the other.

23. In a power transmission chain, the combination of links, joints connecting said linksandadapted to shift them transversely to the line of pull, and camming means, for

shifting them transversely first in one direc-,

tion and then in another indirections tending to minimize transverse disturbances of the chain while permitting the chain to bend.

. 24. In a power transmission chain of the friction joint type adapted to run in a sprocket,the combination of links, joints connecting' said links and adapted for transverse motion across the line of pull, and means for controlling said transverse motion in amount" tive to another for directing the action of one ofsaid bearing surfaces. prior to the other in the operation of bending the chain.

26. A; chain drive including a sprocket, a chain comprising a plurality of jointed links,

and means positively operating on the link joints to prevent the chain duringinitial engagement with the sprocket from accelerating over the normal speed of the chain.

27. Ina chain drive, a sprocket, a chain of the multiplate jointed type and positively acting means for causing the chain to travel onto the sprocket without-lift'in the initial stages of engagement. 1

V. 28. Ina chain drive, thecombination of a sprocket, a' multiplate chain having joints between setsof links, the axis of articulation of which is-movable-in a direction transverse j the run of thechain, and means for shifting the axis ofarticulation of the'joints so that the chain during itsinitial engagement with the sprocketftravels in a line coinciding with the line of pull of the chain.

- 29. An oscillating joint for chains comprising two partsor links adapted to be hinged together, and each provided with a concave bearing surface, and an intermediate 7 pintle member having convex bearing surfaces, andarranged to slide bodily in the concave surfaces as the joint bends.

30. An oscillating joint for chains comprising two parts or links adapted to be hinged together, and an intermediate pintle member having an arcuate bearing surface whose center of curvature is displaced so as to lie on the opposite side of the structural center of the pintle from, the said bearing surface. I I

.31. An oscillating joint for chains com -Ij p'risingtwo parts or links adapted to be hinged togethe'r,each provided with a bear-V.

ing surface, and an intermediate pintle memberhaving a convex bearing surface arranged to slide in a direction'crossing the line of pull of the chain. 7

An oscillating jointfor chains comprising adjacent link members each carrying a concave bearing surface, and a floating pintle member having double convex bearing surfaces arranged for sliding frictional cont-act With the concave bearing surfaces. i

33. An oscillating joint for chains com-- prising 'adjacent link members each carrying-a concave bearing surface, the axis of one of said bearing-surfaces being tilted relativeftoithe lineofpull of the chain, and afloating pintle member having double con vex bearing surfaces arranged for sliding frictional contact With the concave bearing V-surfaces.

2 34. An oscillating joint for: chains comprising adjacent link members'each carrying 1 a concavefbearing surface, the axes-0f saidbearing surfaces being tilted relative to the line of 'pull of the chain, and'a floating pintle member having double convex bearing surfaces arranged for sliding frictional contact with the concave bearing surfaces, r '35. An oscillating joint for chains comprising adj acentf link members each carrying a concave bearing surface, the axes of said bearing surfaces being tilted at different angles relative to the line of pull of the chain, 7

and a floating pintle member having double convex bearing surfaces arranged for sliding frictional contact With the concave bearing surfaces. I V I V '36.,An oscillating joint for chains comprising adjacent linkmembers each carrying a concave bearing surface, and a floating pin- 40" tie-member having double convex bearing surfaces arranged for: sliding frictional contactwith the concave bearing surfaces, the Y "centers of curvature of thejconvexbearing surfaces each lying on the same "side of the structural-center of the floating pintle memher as the convex s'urfaces'themselves.

In testimony whereof I have hereunto signed my: name. I

' FRANK MORSE. 

